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researchv10 Dan Cross

.ds ZZ DEVELOPMENT PACKAGE
.TH RECTARITH 3R "630 MTG"
.XE "raddp()"
.XE "rsubp()"
.SH NAME
rectarith: raddp, rsubp \- arithmetic on Rectangles
.SH SYNOPSIS
\f3
#include <dmd.h>
.br
Rectangle raddp (r, p)
.sp
Rectangle rsubp (r, p)
.sp
Rectangle r;
.br
Point p;
\fR
.SH DESCRIPTION
The
.I raddp
function
returns the Rectangle 
defined by
(\fBadd(r.origin, p)\fR, \fBadd(r.corner, p)\fR).
.PP
The
.I rsubp
function
returns the Rectangle 
defined by
.RB ( "sub(r.origin, p)" ,
.BR "sub(r.corner, p)" ).
.SH EXAMPLE
The following code will return a rectangle with the mouse coordinates
at the center of the box.
.PP
.RS 3
.ft CM
.nf
#include <dmd.h>

Rectangle 
makebox()
{
return (raddp (Rect(-15, -15, 15, 15),
          mouse.xy));

}

.ft R
.fi
.RE
.SH SEE ALSO
ptarith(3R), structures(3R).
.RE

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